This converts to TEST macro in less trivial cases. This is mostly
due to having an intro or outro before/after the actual tests.
Some notable changes:
- add a "test" to make sure the hashmap and ordered_hashmap tests
from different compilation units are actually run in test-hashmap.c
- make root arg a global var in test-install-root.c
- slightly rework an EFI specific test in test-proc-cmdline.c
- usage of saved_argv/saved_argc in test-process-util.c
- splitting test-rlimit-util.c into several tests
- moving the hwdb open check into intro in test-sd-hwdb.c
- condense several "tests" into one in test-udev-util.c
This reverts a major part of: e17c95af8e
Using format strings for concatenating strings is pretty unefficient,
and using PATH_MAX buffers unpretty as well. Let's revert to using
strjoina() as before.
However, to fix the fuzz issue at hand, let's explicitly verify the two
input strings ensuring they are valid path names. This includes a length
check (to 2K each), thus making things prettier, faster and using less
memory again.